Merinda

Archaebacteria

• unicellular
• live in extreme habitats
• one of the first organisms to inhabit Earth

Habitats:

• hot springs
• salty lakes
• swamps

Anarobic enviroments - without oxygen
Thermophiles - heat lovers
Methanogens - produce methane gas
Halophiles - salt lovers

Eubacteria:

• Common bacteria
• Most use oxygen. Few cannot live in oxygen
• Decomposers
• Used in food making
• Cause diseases
• Biomediation - bacteria that clean up oil spills

Shapes of Bacteria

• Cocci - round
• Bacilli - rod
• Spirilla - spiral

Planes - staph
Chains - strepto (ex. strept throat)

Classifying Bacteria

• Gram staining
• Stains bacteria
• Some bacteria stain pink. Others stain purple
• Gram stain positive - purple
• Gram stain negative - pink
• This tells scientists what kind of wall bacteria has more peptidoglycan more rigid wall - gram positive
• Agar - media that is used to grow bacteria
• Strict aerobic - grow only in presence of oxygen
• Strict anaerobic - grow with no oxygen
• Facultative anaerobic - prefer oxygen enviroments but can grow throughout a medium
• Some can metabolism certain substances
• Lactose - bacteria can metabolize lactose (ex. lactobacillus)

Motille - some bacteria can move throughout a media.

• Differential media - some shows different reactions
• Selective media - some can grow certain bacteria

Viewing microbes

• Resolution (seeing detail) can be increased using immersion oil
• Allows light ray to go directly through objective lens

Reproduction - Binary Fission

Conjugation - Bacteria gives its DNA to another bacteria